Collapsible core for concrete piles



Aug. 19, 1930. H. R. SMITH coLLAPsIBLE GORE FOR CONCRETE PILES FiledFeb. 27, 1926 2 sheets-sheet 1 A Tio/ENE YS Aug. 19, 1930. H. R. SMITHCOLIIAPSIBLE CORE FOR CONCRETE PILES Filed Feb. 27. 1926 2 Sheets-Sheet2 WNS.

INI /ENTOR A TTORNE YS IWI .wil/Agra,

A,relatively to the outer casing, thereby vcarrying the expandingcollars of the shaft out of engagement with the youter casing and allow-Y ing thev latter to collapse sufficiently to be Patented Aug. 19, 1930UNITED `STATES PATENT OFFICE HERMAN R. SMITH, OF DOUGLASTON, NEWvYORK,ASSIGNOR T0y RAYMOND CONCRETE PILE COMPANY, OF NEW YORK, N. Y., ACORPORATION OF'NEW JERSEY COLLAPSIBLE CORE FOR CONCRETE PILESApplication led February 27,1926. Serial No. k91,024.

' y' This shaftis provided with a plurality of spaced collars, in theshape of frustums of cones, which cooperate with corresponding surfacesattached to the sectional casing forming the outer surface of the core..The outer casing is made in sections, each section being connected tothe central shaft by short links, for apurpose to be described.

The central shaft is provided at its upper end with a driving head andwith devices to ycontrol the collapsing of the core after the driving isfinished. a

The core is expanded by raising it into vertical position and landing iton a timber, the

weight of the parts causing the cone shaped collars on the central shaftto actV upon the cooperating surfaces ofthe outer core'sections to`expand them to full diameter. The core is held in expanded position bymeans of locking dogs which hold the core sections up to the head. Theshell is put on afterthe core is expanded, and is then driven toposition.

.After completion of the driving operation the core is collapsed bymechanism in the head, actuated through a false driving head, which isin turn actuated by the hoisting effort applied to withdraw the corefrom the driven shell.

The initial movement of the false head serves to actuate a leversystemwhich forces a movement of the central shaft easily Withdrawn from theshell bythe short links connecting it tothe central shaft.

Sometimes, during the driving operatlon,

vthe contacting surfaces of the .central'shaft and outer casing becomeso tightlywedged Y v indersf24, each closed on top with a screw togetherthat it is very diiiicult to draw them hammer. ,manufactura easy to keep1n working order,

curedby threaded joint 22.

apart, and the object of the present invention Ais to provide improvedmeans to Vbring about such movement of central shaft and outer casingrelatively to each other as is necessary in order to collapse the coreafter driving.

In some prior designs the collapsing mechanism comprises a lever ysystemactuated by the false head when force is applied, while in other designsforce is supplied bythe driving hammer or jack.

My present invention discloses an improved device, hydraulicallyoperated, and entirely independent of hoisting tackle or driving Itissimple in design, cheap to and may be operated manually or by power.

In the drawings, Fig. 1 shows an interior view of a complete coreembodying my device, with outer casing expanded.

Fig. 2 shows an interior view of a complete i Y core embodying'mydevice, with outer casing collapsed, and with hydraulic pump attached.

Fig. 3 is .a cross section on line 3 3 of Fig. 2.

Fig. 4 is, an interior view of a complete core showing a modified formof my device, the core being expanded ready for driving.

Fig. 5 shows the samemechanism as Fig. 4 with core collapsedand withpump attached.

Fig. 6 is a section on line 6 6 of Fig. v5.

Referring to Figs. 1, 2 Aand 3, the pile core is formed witha centralmember in the form of a shaft 10, either solid or hollow and provided atintervalsalong its length with collars 12 having outer surfaces in theshape of frustums of cones, and arranged to contact Iwith cooperatingrsurfaces formed on members 14 rattached to the outer casing. The casingis shown as made in three sections 16 but may be of any desired number,two or more. The central shaftand outer casing sections areinter-connected by links 18 which serve, after `collapsing has beeneffected, to withdraw the casing with the shaft.

At its upper end shaft 10 is provided with a driving head 20, into whichshaft 1Q is se- In the top of head20 are bored three cyl*-` bya lpassage34 vand so pijpowei.

55, core and movingslaft 10 nVtcv e fear-'afs eusnigfseeaiiiifzewfplug.26. Within each cylinder 24 is a plunger 28 provided with adownwardly projecting stem `3() which asses through a drilled hole inthe bottom oi) its cylinder and rests on the 5 top of one ofthe sections16 of the outer cas- `o'znd in head' 20, justbelow its upper surface, isthe ring sha ed passage 32, connested tombe upper end-gef each cylinder24 havingnn inlet passage 36.

To the threaded outeretld of `lgmssage-Bi is4 attached a hose 38 fromforce pump 40 which for convenience is mtnliedwin''reservoir42.v 1A,lever handle 44 is shown for operating the Vis desired to removewthecore, hooks48 are 4o` Asktsteins 30 of plungers 28 are restingion the"tolsjocsings 16v the reaction of the oil pressnrebetsbveenA caps 26raises edd andV s Taft `relfively to the` other daingjtflierebywithi'drawin 'conewedges 12 un om ensgemeiiiwan-iiiem ers 14; thus a1-casing 16 tbicoilase sucientl to gf, 7 .f easy winidmwiifr in sie piie sen. lib nesting-naine is attached to head 2o, to-whclzi'shaft 10isittaehed at 22. Links S0 y 18 connect the various sections of thecasing os'siiafineiiibeib arm is provided with a nose 7() in contactwith the wedge-shaped point 72 on the lower end of stem 74 extendingdownwardly from plunger7 6 in cylinder 78. The top of c 1inder 78 isclosed by plug 80. Plunger 6 is normally held at the top of cylinderv 78by spring 82 surrounding stern 74.

Fig. 4 shows the core in expanded positien, 4ready for driving,-withheadV 20 and casing sections v16 in Contact `at 46 and inembers 14expanded by wedges 12. Plunger 76 is'atthe upper end or' cylinder 78,and the nose of the toggle is on or near the vertical center-line of'head 20.

After the driving operation is finished and it is desired to Withdrawthe core, oil is forced between plunger 76`and cap- 80 by ump 40,forcing pluri r 76 downward an V,driving the wedge 72 etwe'en the noseends 70`o`f'the toggl'es, thus straightening the V`:5nd causing them tolift head ,20 relatively to casing 16, thereby causing' the collapse ofthe latter as described above.

Toggle Alevers 60 and 62`are' relieved-of any tension strain while thecore is raised with .hoisting tackle', because pins 66 attire lower endsof toggle links`62 are fitted into slots 84, thus permitting the liftingstrain to be carriedby links 1 I claim:

1. In av collapsible core for pile shells', in combination, an innermember, an ontermember movable relativelyto said'inne'r member andcomprising a plurality of sections, and an hydraulic device arranged'tothrust against each of said outer sections and'react'against said innermember to cause movement ofsaid section relatively to said innermenrber.

2. .The'invention set fcrrth in claim-r in which `rnean's" is providedto support said hydraulic device on said inner' member.

3. In a collapsible core for pile sheils, in combination, an innermember having a head portion, an'outer member comprising a pinrahty ofsections, and afp'lurality ofliyd'raulc devicesl support'led'byr Vsaid'head portion, each of said Hydraulic devices being operable to cause anupward push on said head portion anda downward push on one of saidontersections. f v

4. Ina collapsible core' for pile shells, in combination, an innermember, am outer nienibe'rfconi rising sectibns mumble relatively tosadpinner member, a lever system operatively connecting eaeli of saidysections to; sind' inner memkier,y and ani Hyd'r'aue device supported bysaid innen' member', said lever systems being' ope'rdbie' by hydrain'icdevice to cause relsnve mcvemene-ef sind weer ieseively ai sind innermember;` fori illiel purpose dbseilbd i 5i En a cenapeiblederef 'fer inen, an inner member, 'unf omer @mener maximising4 swims; nomine rele--ftvl'yto' @indiener member, w. eolv'liver iso system operativelyconnecting each of said sections to said inner member, and a hya draulicdevice, said toggle lever systems being simultaneously operable by saidhydraulic device to Cause an upward push on said inner member and adownward push on each of said outer sections.

In testimony whereof I hereto aix my signature.

HERMAN R. SMITH.

